Tuesday's Group G clash in Europe's elite club competition with Schalke will bring about a reunion with Roberto Di Matteo, the caretaker manager who led the Blues to an FA Cup win and glory against the odds over Bayern Munich at the Allianz Arena to deliver the trophy owner Roman Abramovich prizes most for the first time in the club's history.
Chelsea's Champions League run came against the backdrop of a disappointing Premier League season that saw them finish sixth, and Mourinho believes their trophy-winning exploits under Di Matteo provide a classic example of the volatile nature of the competition.
“The Champions League, many, many times I say, is not a consequence of a great work,” the Portuguese told reporters. “Sometimes it is not. You can win the Champions League in the worst season. You can finish fifth and win the Champions League. Right. Liverpool did, and Chelsea, too.
"A knockout competition is something that always has a big percentage of unpredictability.”
Mourinho, who has won the Champions League with Porto and Inter, insists there is no grand secret to success in the competition and is motivated by improving his current Chelsea team rather than emulating the unique achievements of Di Matteo.
“I can only work to improve my team all the time, make a very good team like we are doing," he added. "Me working on the pitch, the club board working at other levels to make a great team like we did in 2004, ’05, ’06 and end with that Champions League.
"But there is nothing we can do [specifically] to win it and you cannot say that is the direction we go in.
“The history is the history that was on the Chelsea bench when Chelsea won the Champions League and Di Matteo is a historic name in this club. And my name is in the history of this club. A club is made of many, many names not one or two names, or one player or one manager.
"I made my history here and now I have the chance to make more history here, and he became Chelsea manager and made his history here.”